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Revenues from Contracts (Contract Balances) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |  |
Unbilled receivables | $ 197.8 | $ 169.4
Contract liabilities - current | (771.6) | (714.1)
Deferred revenue - non-current | (28.9) | (29.8)
Net contract assets/(liabilities) | (602.7) | $ (574.5)
Change in unbilled receivables | 28.4 |
Change in contract liabilities - current | (57.5) |
Change in deferred revenue - non-current | 0.9 |
Change in net contract assets/(liabilities) | $ (28.2) |

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- Definition Contract With Customer, Asset, Net, Increase (Decrease) + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract With Customer, Liability, Deferred Revenue, Billings In-Excess Of Revenues, And Customer Deposits, Current + References No definition available. + Details
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- Definition Contract With Customer, Liability, Noncurrent, Increase (Decrease) + References No definition available. + Details
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Namespace Prefix: | rop_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Contract With Customer, Net Asset (Liability) + References No definition available. + Details
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Namespace Prefix: | rop_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Deferred Revenue, Billings In-Excess Of Revenues, And Customer Deposits, Increase (Decrease) + References No definition available. + Details
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- Definition Increase (Decrease) In Contract With Customer, Asset (Liability) + References No definition available. + Details
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Namespace Prefix: | rop_
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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Period Type: | instant

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- References No definition available. + Details
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- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
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